Here are some simple steps to add custom gadgets to Google Calendar
How To Add Custom Gadgets To Google Calendar
Step 1: Find a gadget that you want to add to Google Calendar and get the URL for it, you can find more info on getting the URL for a gadget in our earlier tutorial for Gmail.
Step 2: You will now have to create a new URL based on this format http://www.google.com/calendar/render?gadgeturl=GADGET_XML_FILE, where you will have to replace the GADGET_XML_FILE with the URL for the gadget.
For example to add the wikipedia gadget to calendar the URL will be http://www.google.com/calendar/render?gadgeturl=http://www.google.com/ig/modules/wikipedia.xml
Step 3: Load this URL in a browser where you have logged into Google Calendar.
Step 4: Once you load the URL, you will see a overlay window asking for your permission to add the gadget to Google calendar, just click on Yes, add this gadget.
You can add as much gadgets as you want, but interactive gadgets other than those developed using OpenSocial may not work.
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